<style src="extra/window-decoration.css" />
<header theme="dark">
  <picture src="extra/calculator.svg" role="window-icon" />
  <window-caption role="window-caption">Sciter.JS Calculator</window-caption>
  <window-buttons>
    <window-button role="window-minimize"></window-button>
    <window-button role="window-maximize"></window-button>
    <window-button role="window-close"></window-button>
  </window-buttons>
</header>
  

